= form_tag(teardowns_path, class:'form') do |form|
  .form-group
    input.form-control name="url" value="#{params[:url]}" placeholder="#{channel_release_url(Channel.take, Release.take)}"
    input name="type" value="url" type="hidden"

  .form-group
    = submit_tag '开始解析', class: 'btn btn-primary'